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Variational principle and a perturbative solution of non-linear string equations in curved space

机译:弯曲空间中非线性弦方程的变分原理和摄动解

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String dynamics in a curved space-time is studied on the basis of an action functional including the small parameter of rescaled tension #epsilon# = #gamma#/#alpha#', where #gamma# is a metric parametrizing constant. A rescaled slow world-sheet time T = #epsilon##tau# is introduced, and general covariant non-linear string equations are derived. It is shownthat in the first order of an #epsilon#-expansion these equations are reduced to the known equation for geodesic deviation but complemented by a string oscillatory term. These equations are solved for the de Sitter and Friedmann-Robertson-Walker spaces. The primary string constraints are found to be split into a chain of perturbative constraints and their conservation and consistency are proved. It is established that in the proposed realization of the perturbative approach the string dynamics in the de Sitter space is stable for a large Hubble constant H(#alpha#'H~2 1).
机译:基于包括小比例缩放张力参数的动作函数,研究了弯曲时空中的弦动力学,其中ε是度量参数化常数。引入了重新定标的慢世界表时间T =#epsilon ## tau#,并推导了一般的协变非线性字符串方程。结果表明,在#epsilon#扩展的第一阶中,这些方程式被简化为测地线偏离的已知方程式,但由字符串振荡项进行了补充。这些方程针对de Sitter空间和Friedmann-Robertson-Walker空间求解。发现主要的弦约束被分为扰动约束链,并证明了它们的守恒性和一致性。可以确定的是,在所提出的微扰方法的实现中,对于大哈勃常数H(#alpha#'H〜2 1),de Sitter空间中的弦动力学是稳定的。

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